Although there is no blood relationship, he always treated his kind sister Yui with care. One day, when their father went on a business trip, as soon as they saw him off and were left alone, her brother-in-law suddenly changed. His distorted love was directed towards Yui. Yui was confined in a room and toyed with. At first, Yui resisted, but was raped and brainwashed by her beastly brother, and then fell into his twisted love...
